The Henan country 10 years ago, yam and taro are the crop of very common second half of the year, ? Have ethnic group rarely however in last few years however, ? Of mechanization carry out, bring about person of present a lot of countries to plant more complex crop no longer, ? It is the machine can pick the crop that harvest, ? For instance corn is mixed earthnut and so on; Because taro cannot use a machine to collect,close, the person that grows so is less and less.